Add method back after removal by JS conversion

packages/rocketchat-lib/server/models/Subscriptions.js

@@ -157,6 +157,17 @@ class ModelSubscriptions extends RocketChat.models._Base {
 		return this.find(query);
 	}
 
+	findUnreadByUserId(userId) {
+		const query = {
+			'u._id': userId,
+			unread: {
+				$gt: 0
+			}
+		};
+
+		return this.find(query, { fields: { unread: 1 } });
+	}
+
 	// UPDATE
 	archiveByRoomId(roomId) {
 		const query =